https://www.openlearning.com/u..../blockdavis-smggsw/b
https://butteranswer49.bravejo....urnal.net/cat-flaps-
Introduce your cat to the flap prior to the installation so that they can be familiar with the size and shape. Open the flap and let your cat explore it from every angle. Make sure that the cutout is square and even. Mark the screw holes and align them with your cat flap opening. The distance between the edges must be equal. Preparation Installing a cat flap inside your home is beneficial for the health and well-being of your pet.